Turiya (t=urIy=) or Super-Conscious State
The Fourth (or Turiya) state is thought of as that which is not conscious of the internal world, nor conscious of the external world, nor conscious of both the worlds, nor dense with consciousness, nor simple consciousness, nor unconsciousness. It is unperceived, unrelated, incomprehensible, unthinkable and indescribable. It is the essence of Consciousness manifesting as the self in all three states, It is the end of all experience; it is all peace, all bliss and non-dual. This Brāhmic state has to be realized and is called Turiya/ Super-conscious state.
The truth about the transcendental state of Turiya cannot really be described by or taught to anyone—it has to arise by itself as a result of the individual drawing nearer to the Self. It is a matter of spiritual evolution.
The individual self has been sleeping in the darkness of ignorance created by maya from time immemorial. When jiva wakes up at the dawn of Knowledge (in Turiya) after many many lives, the world and its objects look unreal like dream objects to him even while he is physically awake! The Turiya state is permanent Jnāna-Samādhi as opposed to temporary Dhyāna-Samādhi. In this state one realizes that waking world is also a transcendental dream world. He comes to realize that the world is not as one sees, and what it really is cannot be seen, except in Turiya state. This is not like one of the three states: waking, dreaming and deep sleep states of the self.
The world of duality exists only due to deep-rooted ignorance created by maya (m==y== m==F=] wd] 8Et=m=<).
The Creator, Creation and Jiva (Jiva, Jagat and Jagadisha) are one and the same with different forms and names. To perceive the existence of Ātman only in the universe is Moksha.
For further study: https://www.gita-society.com/om-purnamadah-purnamidam/